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peterhess May 23, 2016 01:25

Free Convection using chtMultiRegionFoam - wrong results
Hello everybody!

During my training process to use openFoam I work now on free convection simulation using chtMultiRegionFoam...

For this target I built a mesh from two regions a solid region and a fluid one.

The solid region contains a heat source programed in fvOptions file in the solid region constant dictionary.

The fluid region is a prefect gas air assumed...

No radiation (turned of). And no turbulence (laminar), to make the calculation easier...

The mesh has been generated using Ansys Mesher and have very high quality.

- Import made using: fluent3DMeshToFoam Test2.msh!

- The one region imported is splited to two regions using: splitMeshRegions -cellZones -overwrite

- The simulation is splited on two cores using: decomposePar -allRegions

The geometry contains 6 sides, three of them are symmetrical defined.

The upper, lower and back sides are constant temperature 300 K

The contact between solid and fluid is correctly defined (I suppose).

The gravity is defined in Z direction.

To run the simulation simply fire the Allrun file included. The running is in parallel on two cores.

- you can also run using: mpirun -np 2 chtMultiRegionFoam -parallel

Just the last result has been shown here to reduce the size of uploaded file!


At the surrounding walls (upper, lower and back sides), the density of air is about 0.75 and should be theoretically 1.1881

I have no idea why is that happens.

Any idea is welcome



PS: changing to chtMultiRegionSimpleFoam brought also wrong results

peterhess May 23, 2016 01:34

sorry! the file is too big for CFDOnline. I will manage it and repost...

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